Adjustable Armrest Support Assembly for Chair

ABSTRACT

An armrest support assembly for chair includes an upright support member, an outer tube movably and adjustably mounted on the support member and two opposite resting members each secured in the outer tube to move in concert with the outer tube and each abutting the support member during movement of the outer tube relative to the support member. Thus, when the outer tube is moved relative to the support member, the inner wall of each of two resting members presses the support member closely and tightly to stabilize movement of the outer tube relative to the support member, so that the outer tube is moved relative to the support member smoothly and stably without incurring vibration.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an armrest support and, moreparticularly, to an adjustable armrest support assembly for chair.

2. Description of the Related Art

A conventional armrest support assembly 1 for chair in accordance withthe prior art shown in FIG. 6 comprises an upright support member 11, anouter tube 10 movably mounted on the support member 11 and two spacedlimit plates 12 each secured on the support member 11 and each abuttingan inner wall of the outer tube 10. However, the outer tube 10 is notfitted on the support member 11 closely so that the outer tube 10 is notmoved on the support member 11 smoothly and stably, thereby easilyincurring vibration during movement of the outer tube 10 relative to thesupport member 11.

BRIEF SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided an armrestsupport assembly for chair, comprising an upright support member, anouter tube movably and adjustably mounted on the support member and twoopposite resting members each secured in the outer tube to move inconcert with the outer tube and each abutting the support member duringmovement of the outer tube relative to the support member.

The primary objective of the present invention is to provide an armrestsupport assembly that is operated smoothly and stably.

According to the primary objective of the present invention, when theouter tube is moved relative to the support member, the inner wall ofeach of two resting members presses the support member closely andtightly to stabilize movement of the outer tube relative to the supportmember, so that the outer tube is moved relative to the support membersmoothly and stably without incurring vibration.

Further benefits and advantages of the present invention will becomeapparent after a careful reading of the detailed description withappropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

FIG. 1 is a perspective view of an armrest support assembly for chair inaccordance with the preferred embodiment of the present invention.

FIG. 2 is an exploded perspective view of the armrest support assemblyfor chair as shown in FIG. 1.

FIG. 3 is a cross-sectional view of the armrest support assembly forchair taken along line 3-3 as shown in FIG. 1.

FIG. 4 is a locally enlarged view of the armrest support assembly forchair taken along a circle “A” as shown in FIG. 3.

FIG. 5 is a schematic operational view of the armrest support assemblyfor chair as shown in FIG. 3.

FIG. 6 is an exploded perspective view of a conventional armrest supportassembly for chair in accordance with the prior art.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1-4, an armrest supportassembly for chair in accordance with the preferred embodiment of thepresent invention comprises an upright support member 3, an outer tube 2movably and adjustably mounted on the support member 3, and two oppositeresting members 4 each secured in the outer tube 2 to move in concertwith the outer tube 2 and each abutting the support member 3 duringmovement of the outer tube 2 relative to the support member 3.

The outer tube 2 has an inner wall provided with two opposite lockingribs 21. Each of the two locking ribs 21 of the outer tube 2 has asubstantially convex arcuate cross-sectional profile as shown in FIG. 4.

The two resting members 4 are located at two opposite sides of thesupport member 3 to surround and clamp the support member 3 between thetwo resting members 4. Each of the two resting members 4 has an elongateinner wall 45 pressing the support member 3 during movement of the outertube 2 relative to the support member 3. Each of the two resting members4 has a lower end provided with a locking groove 42 locked onto arespective one of the two locking ribs 21 of the outer tube 2 to lockeach of two resting members 4 in the outer tube 2. The lower end of eachof the two resting members 4 is provided with an outwardly protrudinglower pressing plate 41 pressing the inner wall of the outer tube 2. Thelocking groove 42 of each of the two resting members 4 is formed in thelower pressing plate 41. Each of the two resting members 4 has an upperend provided with an outwardly protruding upper pressing plate 43pressing the inner wall of the outer tube 2.

In operation, referring to FIGS. 4 and 5 with reference to FIGS. 1-3,each of two resting members 4 is locked in the outer tube 2 to move inconcert with the outer tube 2, and the support member 3 is surroundedand clamped between the two resting members 4, so that when the outertube 2 is moved relative to the support member 3, each of two restingmembers 4 presses the support member 3 closely and tightly to stabilizemovement of the outer tube 2 relative to the support member 3. Thus, theouter tube 2 is moved relative to the support member 3 smoothly andstably without incurring vibration.

Accordingly, when the outer tube 2 is moved relative to the supportmember 3, the inner wall 45 of each of two resting members 4 presses thesupport member 3 closely and tightly to stabilize movement of the outertube 2 relative to the support member 3, so that the outer tube 2 ismoved relative to the support member 3 smoothly and stably withoutincurring vibration.

Although the invention has been explained in relation to its preferredembodiment(s) as mentioned above, it is to be understood that many otherpossible modifications and variations can be made without departing fromthe scope of the present invention. It is, therefore, contemplated thatthe appended claim or claims will cover such modifications andvariations that fall within the true scope of the invention.

1. An armrest support assembly for chair, comprising: an upright supportmember; an outer tube movably and adjustably mounted on the supportmember; two opposite resting members each secured in the outer tube tomove in concert with the outer tube and each abutting the support memberduring movement of the outer tube relative to the support member.
 2. Thearmrest support assembly for chair of claim 1, wherein the outer tube 2has an inner wall provided with two opposite locking ribs; each of thetwo resting members 4 has a lower end provided with a locking groovelocked onto a respective one of the two locking ribs of the outer tubeto lock each of two resting members in the outer tube.
 3. The armrestsupport assembly for chair of claim 2, wherein the lower end of each ofthe two resting members is provided with an outwardly protruding lowerpressing plate pressing the inner wall of the outer tube.
 4. The armrestsupport assembly for chair of claim 3, wherein the locking groove ofeach of the two resting members is formed in the lower pressing plate.5. The armrest support assembly for chair of claim 1, wherein each ofthe two locking ribs of the outer tube has a substantially convexarcuate cross-sectional profile.
 6. The armrest support assembly forchair of claim 1, wherein the two resting members are located at twoopposite sides of the support member to surround and clamp the supportmember between the two resting members.
 7. The armrest support assemblyfor chair of claim 1, wherein each of the two resting members has anelongate inner wall pressing the support member during movement of theouter tube relative to the support member.
 8. The armrest supportassembly for chair of claim 1, wherein each of the two resting membershas an upper end provided with an outwardly protruding upper pressingplate pressing the inner wall of the outer tube.